Dry-feed machine



'March 1o, 1925- 1,529,173 G. H. DIDINGER DRY FEED MACHINE /NVENTOR A TTORNE Y G. H. DIDINGER DRY FEED MACHINE Maren l0, 1925 Filed Feb. 17, 1922 5 Sheets-Sheet 2 Smc 0 0 BY k6' W mf. www

ATTORNEY March lO 1925 G. H. DIDINGER DRY FEED MACHINE Filed Feb. 17, 1922 5 Sheets-Sheet 3 IIIAIIIH NVENTOR BY /u 1 du-dm A TTORNY March l0, 1925- G. H. DIDINGER I DRY FEED MACHINE .Filed Feb. 17. 1922 5 sheets-'sheet 4 llllllf."""".'flll March l0, 1925- G. H. DIDINGER pm FEED MACHINE Filed Feb. 17, 1922 5 Sheets-Sheet 5 f INVENTOR Patented Mar. 10, 1925*.

UNITED ,STAT-E1s PATENT-:oFFl-'CE-f GEORGE H. DIDINGER, or PHILADELBHLA,'PENNSYLVANIA Application filed February 17, 1922. vSeria-1 No. 537,342.

To all whom t'majz/ concern.'

Be it known that I, GEORGE H. DIDINGER,

a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania. have invented an Improvement in Dry-Feed Machines, of which the following is a specification.

My invention relates to machines which l0 are adapted for feeding powder or granular material in dry form for use in the treatment of water, sewage and the like, and for other analogous purposes.

It is desirable that such machines shall supply the material being fed thereby uniformly in the quantites and the proportions desired with respect to the Aquantity of water, sewage, or other material which is being treated, and it is also ldesirable that such machines shall supply such material in a finely powdered or granular state and not in lumps or relatively large portions or pieces.

The principal object, therefore, of my invention is to provide a machine havingY the capacity of supplying material in the form of a dry powder, in the condition desired, uniformly and in the proportions required with respect to the quantity of water, sewage, or other material to which the powder is being supplied.

A further object of the invention is to provide means for readily regulating the quantity of material to be delivered per l total volume of material being treated and other independently operable means for regulating and proportioning the quantity of material to be supplied perunit of the material, such as water or sewage being treated.

A further object is to provide means for automatically indicating the quantity of powder being fed or delivered in proportion to the total volume of material being treated and also in proportion to each unit of such material.

A still further object of the invention is to provide means for presenting the material to the delivering member, such as a table, in a loose uncompact condition.

Other objects and yadvantages of the invention will be pointed out in the detailed description thereof which follows or will be apparent from such description.

In order that the inventionmay be readily I understood .and its `many practical advantages #fullyV appreciated, reference may he had tothe accompanying drawings forming a part of this specification and in whielrI have illustrated one form of embodiment` thereof. However, it will be understood that changes inthe details of construction may be made within the scope of the-claims without departing from, the invention.l

In the drawings: Fig. l isa view in front elevation of a machine or apparatus embodyingmy invention, certain portionsof the enclosing casing thereof being,v removed in order that certain lofthe mechanism may be shown;A

Fig. 2 isa vertical transverse sectional view taken ontheline 2 2 of Fig. l;

Fig. 3 is a view in elevation of a portion of the front part of the machine, Vcertain parts thereof being removed so as to shown more clearly certain other parts;

Fig. 4 is a view in end elevation looking toward =the' left in Fig. 3;k v.

Fig. 5 is atop plan viewof certain of the mechanism shown in elevation in- Figs. 3 and 4:; .t

Fig. 6 is an enlarged view of a portion of the front part of ,the machine, certain parts thereof being removed in order that other parts thereof may be more :clearly shown; Y

Fig. 7 is a vtransverse sectional view taken on the line 7 7 of Fig. 6; Y

Fig.8 is a view in. elevation showing a pointer f and the Ymeans for actuating the same separate from other mechanism;

Fig. .9 is a top plan view of the machine or apparatus, certain parts of the top casing thereof being broken away in order that portions of the mechanism may be shown;v

Fig. l0 is a view in front elevation of a portion of the machine showing a modified construction of means for actuating the delivering table and of the means for regu-v the discharge of material by said are supported. One portion of the casing isdesignated as a whole by the reference numeral 2, while the remaining portion thereof is designated by the reference numeral 3. The upper end of the portion 2 of the casing is circular in transverse sec tion, `tion means of a coupling 12 to a shaft 13 which table 27 is provided with a worm 14 which engages with and drives aworm gear 15 secured to an actuating shaft 16 near its center. This shaft is referred to as the actuating shaft because from it the various parts of the mechanism of the machine are, during operation, actuated. The worm 14 and the gear 15 are mounted within the gear casing 17 which easing is supported upon the posts or standards 2O rising from the base 1 of the machine. A crank arm 21 is connected to the upper end of the actuating shaft 16, the outer end of which is provided with a bearing roller situated in a slot 22 within the lever 23. The outer or right hand end of the said lever is provided with a depending projection 24 which is situated in an adjustable trough-shaped cam acting guide 25. The opposite end of the said lever 23 is connected to a projection 26v depending from the -lower side of a feed or delivery A The said table extends across the chamber within the casing 2 and is situated about two-thirds of the distance from the top ofthe said casing. Thejsaid table is provided with a hub 28 having an opening therethrough through which the oscillatable shaft 29 extends. The lower end of the hub 28 of the table 27 rests upon a collar 30 secured to the oscillatable shaft 29.*' The table is loosely k mounted upon the saidshaft 29 so that it may. oscillate or rotate relatively thereto. Upon' the rotation of the shaft 16 the'engagement ofthe projection from the crank arm 21 with the sides of the slot 22 causes oscillation of the lever 23. Such oscillation effects oscillating movement of the outer or right hand end of the said lever thereby causing corresponding movement -of the projection 24 within the trough-like cam acting member 25. Such movement of the projection 24 within the said cam-like member causes reciprocating movement of the lever 23 to effect back and forth or oscillating movement of the table 27. rIhe material, in powder form and in a dry state, is first delivered to or placed in a hopper 31 the lower portion only of which is shown inthe drawings. The said material rests upon the top of a screen 32, preferably of wire, situated within and a short distance below the top of the casing 2 and isl supported thereby. The said screen is secured to and supported upon a circular supporting member 33 having a vspider or cross memlbers 34 extending transversely thereof. |The cated cone-shaped rollers 35, the trunnionsv 36 of which are supported in bearings 37 near-the upper end of the casing 2. For the purpose of preventing the screen 32 from clogging I have provided a wiping member 40 which is in the form of a cross and in the lower edges of the arms of which I have secured flexible rubber strips 41. rI`he lower edges of vthese strips contact with-the screen 32 and as the latter is oscillated or rotated there is relative movement between the same and the said rubber wiping strips 41 whereby the powdered material, such as lime, is prevented from cloggingthe screen openings and is caused to be discharged therethrough. The member 40 is station1 arily secured within the upper endv portion of the casing 2 a short distance from the top thereof by means of screw bolts 43.

For the purpose of agitating the powdered or granular material within the casing 2 above the table 27 and below the screen 32 to prevent the same from caking or becoming packed, I have provided agitating bars 45 which are supported from the upright oscillatable shaft 29. Only two of these agitating bars are shown but the number may be increased.

Oscillation of the shaft 29 is effected by means of a 'link 47 connected at one end to the outer end of an arm 48 secured to the lower end of the said shaft 29. The oppositev end of the said link is connected to a crank arm 49 projecting from the lower end of the rotatablefshaft 16 previously referred to. Rotation of the shaft 16 and the crank 49 attached thereto causes Yreciprocation of the link'I 47 which beingF connected to the arm 48 upon the lower end of the shaft 29 causes oscillation of the latter. rllhe os-V cillation of the shaft 29, as already indi cated, is independent of the oscillation of' the table 27. At each oscillationV of the table 27 a portion of the powdered material resting thereon within the casing 2 is carried or conveyed through openings 50 and 51 inthe front of the said casing. The size of the passageways through these openingsl through which the material may be delivered by oscillations of the table 27 Vj may be varied by the vertically adjustable doors llO 58 may be effected byl means of the hand wheel 60 upon the upper end thereof. By rotating thisY shaft iii-one direction or the other the gates or doors52 may beraisedor lowered as desired.'4 They are guided inl their vertical movements by the guides 6l and'62. As will be hereinafter referred to andinore fullydescribed, the adjustment of the gates controls the rate offeed of the powderedmaterial with respect to each unit of water or other material to be treated,-

whereas the extent of the vibrations or oscillations of the table 27, as hereinbeforedescribed, regulates or controls the rate of feed of the said-powdered material with' respect to each million ofsuch units ofthe material, such aswateigsewage andthe like being treated. Y

Assuming that the table-27 has been oscillat'ed to the-leftl or inian anti-clockwise direction, a certain amount of material would have been conveyed and delivered through the portion of the. opening` 50 below the lower edge of the gate 52 and in order to prevent the returnof the material or a portie-n thereofback through' the said opening into the casing,y 2 I have provided a scraper which is adapted? to be'reciprof cated back` and forth to alternately openandclose theopeningsf50 and 51 and to push or scrape theunaterial from the table 27 as the latter isf-oscillated.` i

Assuming that in F ig. 6 the table has just completed an oscillation in anA anticlockwise ward through the Vopening 50 below` the lowerv edge ofj the gate 52; immediately upon the completion ofI such movement of the table and-prior to the time of the be gii'ining of itsmove-ment inA the opposite direction the scraper 70 is moved towards the opening 5ll below the.' loweredgevk ofi The scraper 70 then .retin-nsf the gate 53. t to the position as indicated'inFig. 6 so `that as the table 27 beginsits returni-anti-clock-- wisemovement the saidr scraper-@prevents direction andv thata` certainI amount of material'has-been conveyed forthe return of the material or any.v portion thereof back into the'y casing` thro-ugh thel opening'l and causes the same to be discharged from the'said table 27.

Thescraper 70 is supported upon the angular arm 7l which in turn is su orted` upon the end portion' of a reciprocating bar 72 which is guided in be-aringsuponthe front portion of the casing 2. The opposite end portion of the bar 72 is lbent and extended downwardly as indicated aty 74 and the lower end of such downwardlyv bent and extended portions is pivotally con.- nected at 75 tothe upper end of an arm 76 which isrigidly connected to a shaft 77 supported in bearings 7 8. Said shaft is provided with a miter gear 79 which is in engagement with a miter gear 8O upon a shaft 8l supported in bearings 84 upon the base l. The saidshaft 8l is provided with upwardly eXtending projections and 86 with which Va tappet 87 contacts. The. said tappet is connected withand depends from the outer end portion .of the crank arm 49 previously'referred to and is adjustable soas to lengthen orshorten the same so as to vary or adjust the thrown of the projections 85 and 86 `and thereby vary the eX- tent of the oscillatory movements o-f the` shaft 81 and'- ultimately of the shaft 77 and of the arm 76 and the parts connecteditherewith. i f

The angular relation-between the crank arms 49 and 2l is suchvthat the tappet .87 contacts 'with the `projections 85 and-86 to actuate the same alternately in oppositevdi' rections so as to effect oscillatoryA movements of the arm 7 6 thereby causing reciprocatingA movement of the scraperi() at theproper times with respect toftheioscillations of the table 27. f f 'f The trougli-shaped cam-acting member 25 is supported upon the upper endof apost- 90 which is adapted to be rotatably adjusted by means of a, handle 91.` This handle is associated with a scale 92 graduatedfromi Zero to ten. In F ig. 9 of the drawinggthehandleA is indicated VVas being adjustedfto the number ten, in which position the lever 23 is caused to reciprocate through the maximum distance of whichit is capable infthe construction asshown. At` the same time the table 27 is oscillated through the maX- imum arc, feeding or delivering'.theinaxi-v mum amount ofv material which may be deliveredthrough the openings'50 and 5I with the gates or doors 52 and 53 occupying a certain position. If the positions of the doors or gates 52L are varied it follows that with a given amount" of oscillatory movement of the table 27 the quantity of' material delii'feredwill vary; Thequantity of material delivered as a result of the ade. justment ,of thel troughfsha'ped vcam-,acting member is proportional to the numberYV` of units, as for instance, gallons, of material to which the powder is to be delivered.

f The machine is particularly designed forV the treatment of water in filtration plants and consequently the adjustment of the said trough-shaped cam-acting member is withv respect to the water to be treated in terms of millions of gallo-ns.

The adjustment of the doors or gates 52 has relation to and is adapted to pro-portion the quantity of powdered material delive-red to each unit of the material, such as water, being treated. By lowering the said doors or gates the quantity delivered per unit of water to be treated is decreased while by ,elevating the same the quantity per unit is increased. Y v- F or the purpose of facilitating the adjustment of the doors 52 and 53 so as to deliver the quantity of material desired to supply the portion requiredper unit of material, such as water, being treated, I have provided a`sca'le 95 graduated from zero to five. A pointer 96 co-operates with the said scale and as adjusted in Fig. 1V ofy the drawings indicates that the doors 52 and53 are adjusted so as to permit the delivery of a suflicient quantity of material to. provide more than two and less than two and a half' units of powder per unit of material being treated, whatever these units may be. The unit of material being treated may be the gallon, while the unit of powdered material to be added thereto may be the grain or any other unit indicating a relatively small quantity.

For the purpose of automatically actuating the pointer 96 upon the adjustment of the doors 52 and 53 I have provided a rack 98 which is secured upon the bar 56 which engages a pinion 99 upon the short shaft 100 upon the outer end of which the pointer or indicator 96 is fastened.

The material which is discharged from the table 27 as hereinbefore described falls into a hopper 101 and is delivered therefrom throughv a short pipe 102 to an eduction pipe 103eby which it is conveyed to the water, sewage or the .like which is being treated. For the purpose of causing and facilitating the .discharge of the material from the hopper 101 I provide means ,for supplying water thereto which comprises a pipe 104 leading from the pipe 105, the said pipe 104 being connected at its upper'end to the'upper part of the hopper 101 and discharging into a channel 106 at the upper edge of the said hopper. The pipe 105 supplies water to the eduction pipe 103. A valve at 108 controls the supply of water through the pipe 105 to the keduction pipe 103.

The mechanismfor actuating the pointer 'As already stated, the apparatus embody: l

ing Vmy invention comprises two separate and independent means for regulating andcontrolling the quantity of'material delivered from the table 27. One of these means is adapted to regulate the quantity of material desired or required per single unit vof water, sewage, or the like being treated,r while the other regulates andV controlsthe.v

quantity of material to be delivered for klarger amounts of water, sewage or the like being treated which may be measured in millions lof gallons. The said devices are adapted to and may be caused to co-operate to yfeed the material from the casing 2 in properly regulated and proportioned quantities.

In Figs. 10 to 12, inclusive,I have shown a modified construction of feeding means in which the ,table 27 is not oscillated but 'is rotated step by step in a single direction. In this construction the lever 23 is provided at its inner end with a couple of pivoted arms 110 and 111. The arm 110 is connected at its outer swinging end to an arm 112 while the arm 111 is connected toa similar arm 113 both of which are mounted to oscillate upon the ,table supporting shaft 29. The outer ends of these arms 112 and 113 are provided with pawls 1111 and 115 pressed inwardly by springs A116. Each of` said pawls points in the same direction and is in engagement with the ratchet teethupon a ratchet wheel 117 which is rigidly secured to the hub 28 of the table27. The arms 112 and 113 are arranged in angular relation with respect to each other. As also appears, the arms 110 and 111 are-situated upon opposite sides of the shaft 29. It will be apparent that upon an inward movement of the reciprocating lever 23 the arm 110A will cause movement of the arm 112 to the right (having reference to Fig. 11) while the arm 113 will be moved to the left. The pawl 115 being in engagement with a tooth upon the ratchet wheel 117 will cause movement thereof. Upon reverse or outward movement of the lever 23 the arm 113 will be moved toward the right (having reference to Fig. 11) while the arm 112 will .be moved to the left causing further movement of the ratchet wheel 117 in the same direction.

The'table 27 will be moved in like direction so that the material supported thereon within the casing 2 will be delivered through the single opening 120 controlled by the gate 121 which is adapted to be adjusted by means of the adjusting rodV 122 supported in a vertically stationary position in a bearing 123 upon the casing v2. rThe material which is removed from the casing by the table 27 is scraped from the said. table by the front portion of the casing 2 at the right hand side of the opening 120, having reference to F ig. l0 of the drawing. i

Having thus described my invention, what I claim and desire to secure by Letters Patentis:

l. In a dry-feed machine, the combination of angularly adjustable means for controlling the quantity of substance to be fed in proportion vto the total volume of material being treated, with means for controlling the quantity of said substance to be fed in proportion to each unit of the said material being treated, said first named proportion being varied without stopping the'machine by varying the angle of vadjustment lofthe said angularly adjustable means.y

2: In a dry-feed machine, the combination of means 'for controlling the quantity'of substance to be fedrin proportion tofeach unitV of material to be treated andl inde'- pendently controllable-means adapted to be angularly adjusted for controllingthequantity of said substance in proportion. to a relatively large volume of the material, to be treated including -a predetermined number of said units, the said last named proportion being varied without stoppingthe chine by varyingthe angle of adjustmentof the said angularly adjustable control-ling means.

3. In a dry-feed machine,` the combination of controllable means for regulating the quantity of substance in powdered form tov-be fed in proportion toeachy unit of water or sewage to be treated, .and independent controllable means adapted to be angularly adjustedfor controlling the quantity of said substance in proportionto relatively large volumes of the said water or` sewage including a relativelylarge predeterminedv number of said units, the said last named proportion being .varied without stopping'the machine by varying the angle of adjustmentjof the said angularly adjustable. controlling means.

4. In a dry-feed machine, the combination of a feed table, Ymeans for supplying` to ysaid table in powdered form the. substance tobe fed therefrom, means for actuating the said table to feed the said substancetherefroin, and two separate and independently acting means forA regulating and controlling, the

rate of feed of said material from said table, `one of said means being angularly adjust-A able to vary the feeding of said material in proportion to the total quantity of material being treated without interruptiiigtheoper-'- ation of the machine.

5. In a dry-feed machine, the combination of a feed table, means for supplying to said table in powdered form `the substance tobe fed therefrom? means @realises @Cillo-story movements of said tablefto feed the` said material therefrom, angularl-y" vadjustable means for varying the extent of thev movements of saidftable to; vary'` the quantity of substance delivered:therefrom in proportion to themtotal quantity ofV material being treated which means may be adjusted'without lstoppingthe machine, and independent controllable, means for regulatingand con-Y trolling thel rateof feed of/said substance from said ltable in proportion to leach 'unit opuantityvl of `materialv Ibeing treated. i

6. In a dry-feed machine, the combination of a feed table, means forv oscillatingsaid table, means` for` supplying, a substancev in powdered form to said table, and means .for causing a quantity of material to be discharged from'said table. at each oscillation. 7. In a dryfeed machine, the combination of a feed. table, a casing across which said tableA extends, the said casing havingL an opening through which ka portion thereof projectsand valso'jhaving a couple vof spaced openings extending upwardly" from said table, means for supplying a' substance in powdered form to said table, means for oscillating said tableV to carry portionsA of saidf substance alternately through sai-d spaced openings, means for alternately opening and closingsaid openings to lpermitthe feedy of portions of, said substance through one of-the same'l and at ythe same4 time prevent thel return oi otherr portions through the otherv ofsaid'openings.'

l8,. In a dry-feed machine, the combination. of a feed-table,' a casing across which lsaid table .extends the said casing havingjan opening "through'which' a portion of said table. proietta and also having a ople 'Of spaced openings er;tendingl upwardly from in ipowderedlfform` to, the chamber of said casi-ng above said'table, the said substance withinY` the casing` being supported upon said table, 'means 'for oscillatingk said -tableto carry portionS of the said 'substance alternately 'through the. said spaced openings, afn'doscillating means for alternately opening and closingl the said openings for the purposefdeacrbed. c 1

In ay dryfeed machine, the combination 0f feed table'mearls for Supplying@ Su'bstance in powdered form vto said table', means for 'oscillating said table, and means for `varying th distance 'through which4 said table'is' adapted tojbel oscillated. "104 In a dfyfeedmahle; the combination of feed tablefmelafol Supplying a Su'btanae fn' powdered" form "to, ,Said table adapted to be scillafted;

"lele a efr-feed lesbi-seth@ cabina said table,1n`eans for supplying a substance i tojbeifaji therefrom', means for @e1tina-..125

tion of a feed table, a casing having a'chamber across which the said table extends, a portion of said table projecting through an opening in a wall of said casing, the lsaid wall having a couple of spaced openings extending upwardly from the said table, means for alternately opening and closing the said openings, an actuating member, and independent means actuated by said member for oscillating the said table and for reciprocating the said means for alternately open ing and closing the 'said openings, substantially as described.

12. In a dry-feed machine, the'combination kof a. feed table, a casing having a chamber across which the said table'extends, the said casing having anopening in a wall thereof through which a portion 'of said table projects, and said casing also having a couple of spaced openings extending upwardly from the said table, a revoluble shaft, means actuated by said shaft for causing oscillations of said table, means for alternately closing the said spaced openings, and means intermediate the said last mentioned means and the said shaft for causing reciprocating movements of said closing means. K

13. In a dry-feed machine, the combina* tion of a table, a casing having a chamber across which the said table extends, said casing having openings spaced apart through which a substance in ,powdered form, is adapted to be fed from saidchamber, means for supplying the said `substance to saidV chamber, agitating means within said cham- Y ber above said table,`a revoluble shaft, means actuated by said shaft for' causing oscillating movements of said table, and means in'- termediate said shaft and the said agitating means for actuating the latter.

Y 14. In a dryefeed machine, the combination of a table, a casing having a chamber across which the said table extends, saidcasing having an opening through which a portion of said table ,projectsv and also having a couple of spaced openings extending up-V wardly from saidtable, a lev-er having connection at one end with said table a. distance from its axis, an adjustable guiding and cam acting device in engagement with the opposite Vend of said lever, andmeans for caus ing oscillating movements of saidv lever to thereby cause oscillating movements of the last mentioned vend thereof whereby reciprocating movements of said lever are effected Yto cause oscillating movements of said table.

, 1-5. In la dry-feed machine, theV combina-f'v Y tion of a feed table, a casing having a chamber across which the saidtable extends,l -50 means for supplying a substance in powdered form to said chamber, which substance is supported upon said table, a vertical shaft within said casing upon which said table is ,rotatably mounted,V agitating means sup? ,parted uro-1.1 .Seid ,Shaft abeiesed tabl? with? in the said chamber, a revoluble'shaft, and separate and independent means intermediate said revoluble shaft and the said table and the said'irst mentioned shaft for effecting independent oscillating movements thereof. v

y1t. In adry-feed machine, the combina-Y tion of a feed table, al casing having a chamber acrossv which the said table extends, a portion of said table projecting through an opening in a wall of said casing, one'or more discharge openings through saidwall extending'upwardly from said table, a screen extending `across the said chamber near the upper endof said casing, the said screen being adapted to support the substance to bel supplied to said chamber, an agitator within said chamber intermediate the said screen and the said table, the said` agitator and the said screen being connected together, means for oscillating, said agitator, and means for oscillatingthe said table.

17. In a dry-feed machine,the combination of anoscillatable feed table, a'flever having pivotal connection at one end with said table a distance from its axis, a guiding cam acting member in engagement with ends to effect oscillation thereof to thereby effect lreciprocating movements thereof and cause oscillating movements of saidtable.v

18. In a dry-feed machine, the combina tion of a feed table, a casing having a .cham- .ber across which the said table extends` means for causing oscillating movements of said table, a screenV situated in the chamber of said casing adistance above said table and below the upper end of said casing,fme'ans 'for supplying a substance to said casing,

means foroscillating said screen, and sta-` tionaryv wipingV means contacting with the upper side of said screen to kprevent the said" substance from lodging withinl the openings of said screen to clog` the same. Y

. 19. In a dry-feed machine, the combination Yof a feed table, a casing having a cham-N ber across which said table extends, means for oscillating said table, a shaft extending upwardly through said chamber within said casing, means for oscillating said shaft, a screen supported upon said shaft, means for supplyingl a substance to the upper part of' ,said chamber above said screen, said substance being supported upon said screen, an

agitator also supported upon saidshaft and ,situated below saidvscreen and above'the'said. table, 'and wiping devices'situated within`l said chamber and contacting with the upper side of the said screen to prevent clogging of the openings therethrough.

Vv2O. In a dry-feed machine,pthe combina,-v` :ftpn 94? a @feed tablas easing havnga cham# ber across which said table extends, a portion of said table projecting through an opening in a Wall of said casing, the said Wall being provided With a plurality of spaced openings extending upwardly from the said table, a revoluble actuating shaft, means actuated by said shaft for causing oscillating movements of said table, means for varying the extent of said oscillating movements, means for varying the size of the said spaced openings, means for alternately opening and closing the said openings, an arm having connection With said means, and means intermediate the said arm and the sa1d actuating shaft whereby revolution of the latter causes oscillating move ments of the said arm to eect reciprocating movements oi the said closing means, substantially as described.

In testimony that I claim the foregoing as my invention, I have hereunto signed` my name this 16th day of February, A. D. 1922.

GEORGE H. DIDINGER. A 

